diff --git a/lab31.py b/lab31.py
new file mode 100644
index 0000000..931871f
--- /dev/null
+++ b/lab31.py
@@ -0,0 +1,15 @@
+iban = input("Inserisci un iban valido: ")
+
+iban_ruotato = iban[4:]+iban[:4]
+
+iban_numerico = ""
+for c in iban_ruotato:
+    if c.isalpha():
+        iban_numerico += str(ord(c)-ord("A") + 10)
+    else:
+        iban_numerico += c
+
+if int(iban_numerico) % 97 == 1:
+    print("Iban valido")
+else:
+    print("Iban non valido")
\ No newline at end of file